Add <menuitem>, new HTMLMenuElement IDL attributes.

Source/core/html/parser/HTMLStackItem.h

 /*
  * Copyright (C) 2012 Company 100, Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 160 matching lines @@
             || tagName == HTMLNames::htmlTag
             || tagName == HTMLNames::iframeTag
             || tagName == HTMLNames::imgTag
             || tagName == HTMLNames::inputTag
             || tagName == HTMLNames::liTag
             || tagName == HTMLNames::linkTag
             || tagName == HTMLNames::listingTag
             || tagName == HTMLNames::mainTag
             || tagName == HTMLNames::marqueeTag
             || tagName == HTMLNames::menuTag
+            || tagName == HTMLNames::menuitemTag
             || tagName == HTMLNames::metaTag
             || tagName == HTMLNames::navTag
             || tagName == HTMLNames::noembedTag
             || tagName == HTMLNames::noframesTag
             || tagName == HTMLNames::noscriptTag
             || tagName == HTMLNames::objectTag
             || tagName == HTMLNames::olTag
             || tagName == HTMLNames::pTag
             || tagName == HTMLNames::paramTag
             || tagName == HTMLNames::plaintextTag
@@ skipping 47 matching lines @@
 
     AtomicString m_tokenLocalName;
     Vector<Attribute> m_tokenAttributes;
     AtomicString m_namespaceURI;
     bool m_isDocumentFragmentNode;
 };
 
 } // namespace blink
 
 #endif // HTMLStackItem_h